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ON CONFLICT DO UPDATE was a blind full-row overwrite. Open-data station rows always carry null visibilityMin/dewPoint/sunDuration and an empty phenomena array (fields it doesn't publish), so once a second source (FTP) writes real values for those fields, a later open-data write for the same (city, dateTime) would silently null them back out. Switched to COALESCE(excluded.field, weather.field) so a missing value from one source never erases a real value the other already wrote; phenomena needs NULLIF against an empty array specifically, since Scala's List[String] never maps to SQL NULL.
Weather Tool
Tool for downloading historical and real-time data from weather stations in Latvia. It aggregates and displays data for different time periods, cities, and weather parameters.
Setup
Rename .env-sample to .env and fill in credentials
Environment boundary
- Windows: source editing, review, and Git operations only. Do not compile, build, run containers, install project dependencies, or test the application here.
- Rocky Linux: the only development runtime; compile, build, run, seed, and test WeatherTool here.
- Ubuntu VPS: deployment target only. It receives the reviewed release artifact built and verified on Rocky; it is not a development or build host.
Run
docker-compose up --build --no-cache --force-recreate
Web
nginx proxy config
server {
listen 80;
server_name laikazinas.lsm.lv;
location / {
proxy_pass http://localhost:9090; # Forward requests to the Scala app
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection 'upgrade';
proxy_set_header Host $host;
proxy_cache_bypass $http_upgrade;
}
}
Rocky development runtime
// 1st terminal
podman-compose up postgres
// 2nd terminal
sbt run
// 3rd terminal
cd web/
npm run dev
Run one file
sbt "runMain grib.GribParserTest"
Backend Tech:
- scala: cats-effects, http4s, fs2, circe, scalatest
- postgres
Frontend Tech:
- SolidJS
- Vite
Fly commands
// suspend instance
fly scale count 0
// check display
fly ssh console
df -h
fly scale memory 512